Typewriting machine



K. E. MARSH.

TYPEWRITING'MACHINE. APPLICATION FILED JULY 22,1920.

1 ,424,8% 1 Patented Aug. 8, 1922.

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KENNETH E. MARSH, OF GRO'I'ON', NEW'YORK, ASSIGNQR T0 CORONA TYPEWRITEB COMPANY, INC., 0F GROTON, NEW YORK, A. CORPORATION OF NEW YORK.

rrrnwnrrrne MACHINE.

Specification of Letters Patent.

Patented Aug. 8,

Application filed July 22, 1920. Serial No. 398,109,.

To all whom it'mcty concern Be it known that I, KENNETH E. MARSH, a citizen of the United States, and resident of Groton, in the county of Tompkins and State of New York, have invented certain new and useful Improvements in Typewriting Machines (Case No. 17 8), of which the following is a specification.

This invention relates to improvements in typewriting machines, and more particularly to the line-spacing mechanism thereof, and has for one of its objects the provision of simple and efficient mechanism for rotating a platen for line spacing, readily adjustable for single or double spacing, and so constructed. as to prevent overthrow or excessive rotation of the platen. Another object of the invention is to provide a line spacing mechanism of simple, light, compact and inexpensive construction especially adapted for use on small portable typewriting machines,- such as the well-known Corona folding typewriter, and said mechanism consisting of a minimum number of parts and being constructed substantially entirely of sheet metal. Other objects of the invention will .morefully appear from the following description of the invention in detail, with reference to the accompanying drawings.

In the drawings, Fig. 1 is a top plan view showing; one end, of a platen carriage and platen with theimproved line spacing mechanism associated therewith, the parts being shown in normal position whenadjusted for double spacing;

Fig. 2 a view similar to Fig. 1 showing the line-space mechanism adjusted for single spacing;

Fig. 3 a front elevation, partly in vertical section, showing the position of the parts at the end of the line-spacing movement of the line-space lever;

Fig. 4 a vertical transverse section on the line TV-IV of Fig. 1;

Fig. 5 a view similar to Fig. 4c, the linespace lever being shifted to the position shown in Fi 3; I

6 a Front elevation, the parts being in the posit-ion shown in Fig. 1; d

Fig. 7 a section on the line VII-VII of Fig. 6; j I

8 a perspective view of the adjustable stop;

Fig. 9 perspective view of the supporting bracket; and

Fig; 10 a perspective view of the linespace lever and parts carried thereby.

Referring to the drawings by numerals, 1 designates the bottom plate ofa sheet metal carriage having integral end brackets or upstanding portions2 in which the shaft 3 of platen a is journalled adjacent the ends of the platen. The platen carriage, a. ,part of the left-hand end only of which is shown, may, however, be constructed in various ways and be mounted on a bed or other support in any suitable manner to travel endwise for letter spacing. The line-space wheel may be connected to rotate with the platen in any suitable manner. I have shown a well-known form of line-space wheel comprising a ring or annulus 5 having a toothed perimeter and held on the hub 6 ofthe platen 4: to rotate with the platen. The usual finger wheel 7 is fixed on the end of the, platen shaft.

A sheet metal bracket or angle plate 8 is mounted on the platen carriage with the vertical portion thereof abutting against the inner side of the left-hand end bracket 2 of the carriage. The base flange of plate 8 is secured to the base platel of the carriage by screws 9, and the vertical portion of the angle plate is provided with an aperture 10 registering with the platen shaft bearing opening in end bracket 2. Aperture 10 is of greater diameter than the platen shaft 3 and the reduced outer end port-ion 6 of the platen hub (S-fits in said aperture with the circumferential shoulder formed adjacent the outer end of the hub at the inner end of reduced portion 6 abutting against the inner face of the angle plate 8.

The vertical portion of angle plate 8 is provided adjacent its upper end with two integral laterally extending parallel arms 11 and 12 terminating intermediate the finger wheel 7 and end bracket 2 and provided wit-h apertures 13 and 14. Arms 11 and 12 are spaced apart from front to rear a distance substantially equal to the diameter of the line-space wheel 5, and are located above and at opposite sides of the platen shaft Aperture 13 is provided with screw threads and a pivot rod 15 supported at one end in aperture 14 is threaded at its other end and screwed in aperture 13.

The line-space lever 16 is formed of sheet i'netal and provided at its lower end with a forwardly extending horizontal portion 17 shorter than the distance between arms 11 and 12, and lever 16 and arm 18 are provided just above the connecting member 17 with apertures 19 for supporting the lever and its connected arm to rock and slide in unison on rod 15.

A curved arm or rigid linespace pawl 20 formed integrally with the line-space lever extends inwardly and downwardly over the upper edges 01" end bracket 2 and plate 8 to a point overhanging but out ofcontact with H the ratchet wheel 5, and an angular stop lug 21 extends inwardly from the lever 16 below pawl 20, the free end of said lug extendingvei'tically downward below the horizon tal plane of the pivotal axis of the lever. The vertical edge of thefree end of angular stoplug 21 is adapted to abut against the outer face of the end bracket 2 of the carriage to' limit the pivotal. movement of the linespace lever toward the left or away from the line-spaced wheel.

' A coil spring 22, connected at its upper end with part1? of the line-space lever at the outer side of rod 15, extends forwardly and downwardly at the rear of the platen shaft 3 and is connected at its lower end with a lug 23 stamped from the end bracket 2 of the carriage at a point under the platen shaft. The spring 22 serves to rock lever 16 aboutshaft 15 until arrested by lug 21,

and to simultaneously pull the lever forwardly along said shaft 15. The normal position'of the lever longitudinally of shaft 15 is determined by anadjustable stop lever 24 pivotally held by a pivot screw 25 on the upper side of a horizontal arm 26 formed on angle plate 8 forward of the line-space lever 16. Stoplever 24. has two straight stop faces or edges 27 and 28 at right angles to each other and different distances from its pivot and adapted to be engaged by the forward side of the line-space lever in, different adj usted positions of t io stop lever to limit the forward sliding movement thereof under the influence of'spring 22, and thus determine the initial. or normal position of pawl 2-0 relatively to the teeth of the ratchet wheel 5 in sin 'le and double spacing. The stop edge 2? cooperates with lever 16 when the mechanism is set for single spacing, and stop ,edge 28 cooperates with lever 16 when the mechanism is set for double spacing. A lug .29 stamped down from stop lever 24.- is adapted to engage a shoulder 30 on arm 26 stop edges 27 and 28 may overhang the rear edge of arm 26 in single and double-space positions of the lever 24: respectively but I prefer that stop edge 28 be in the same plane as the rear edge of arm 26 when the stop lever is set for double spacing, so that the line-space lever will abut against arm 26 as well as the stop lever, as shown in Figs. 1, 4' and 7.

As heretofore described, the line-space pawl 20 is normally free of the teeth of the ratchet wheel so that the platen may be rotated in either direction by finger wheel 7. The usual detent roller 32, journalled in a yoke on the free end of a flat spring 33 held to the carriage by a screw 34, is provided for holding the platen against accidental rotation. Overthrow or excessive rotation of the platen when the line-space lever is quickly or violently operated is prevented by an overthrow lock or rigid pawl 35 formed as an integral inwardly and slightly downwardly curved extension of the arm 18'.

The pawl 35 is shorter than pawl 20 and passes inwardly and downwardly through an opening 36 in angle plate 8 when the linespace lever is swung toward the right' The end of pawl 35 engages the longer face of one of the teeth of ratchet wheel 5 at a point forward oi a vertical plane through the l0ngitudinal axis of the platen to prevent further movement of the ratchet wheel and line-space lever when the line-space lever is rocked toward the right to a predetermined point as shown in'Figs. 3 and 5. The final position of the line-space lever and pawls 20 and 35' is alwaysthe same, this position being shown in Figs. 3 and 5, and the extent of pivotal movement of the line-space lever'is always the same, but the extent of sliding movement of the lever and point of engage ment of pawl 20 with the ratchet wheel varies with the adjustment of stop 24 which determines the initial position of the lever longitudinally of the sliding and pivotal support 15.

What I' claim is:

1. In a typewriting machine, the combina tion of a rotatably supported platen, a ratchet wheel rotatable with said platen, a pivotally and slidably supported line-space lever, afixed pawl carried by said lever line-space lever pivotally supported to, rock about an axis parallelwith the plane of the ratchet wheel, and a line-space pawl and an overthrow locking pawl spaced apart longitudinally of the pivotal axis of the lever and connected to move in unison therewith.

3. In a typewriting machine, the combination of a rotatably supported platen, a ratchet wheel rotatable with the platen, a line-space lever pivotally supported to rock about an axis extending transversely of the platen, and a pair of fixed pawls carried by said lever and spaced apart longitudinally of the pivotal axis thereof adapted to successively engage the ratchet wheel when the lever is rocked in one direction.

4:. In atypewriting machine, the combination of a rotatably supported platen, a ratchet wheel rotatable with the platen, a

line space lever, means supporting the leverfor pivotal and sidewise movements, a pawl operable by said lever for rotating the ratchet wheel, means for regulating the extent of sidewise movement of the lever at will, and means for always arresting the pivotal movement of the lever in opposite directions around its axis at the same two points.

5. In a typewriting machine, the combination of a rotatably supported platen, a ratchet wheel rotatable with the platen, a line-space lever, means supporting the lever for pivotal and sidewise movements, a pawl operable by said lever for rotating the ratchet wheel, two independent arresting devices movable with the lever for arresting the pivotal movement of the lever in different directions at two fixed points, and adjustable means for limiting the extent of the sidewise movement of the lever.

63. In a typewriting machine, the combination of a rotatably supported platen, a ratchet wheel rotatable with the platen, a line-space lever, means supporting the lever for pivotal and sidewise movement, a pawl operable by said lever for rotating the ratchet wheel, and an overthrow pawl operable by the lever adapted to engage the ratchet wheel subsequently to the engagement of the other pawl therewith to limit the pivotal movement of the lever in one direction.

7. In a typewriting machine, the combination of a rotatably supported platen, a ratchet wheel rotatable with the platen, a line-space lever, means supporting the lever for pivotal and sidewise movement, a pawl operable by said lever for rotating the ratchet wheel, an overthrow pawl operable by the lever adapted to engage the ratchet wheel subsequently to the engagement of the other pawl therewith to limit the pivotal movement of the lever in one direction, and adjustable means for limiting the sidewise movement of the lever.

8. In a typewriting machine, the combination of a rotatably supported platen, a ratchet wheel rotatable with the platen, a

line-space lever, means supporting the lever for pivotal and sidewise movement, a pawl operable by said' lever for rotating the ratchet wheel, an overthrow pawl operable by the lever adapted to engage the ratchet wheel subsequently to theengagement of the other pawl therewith to limit the pivotal movement of the lever in one direction, adjustable means for limiting the sidewise movement of the lever, a spring for normally swinging and sliding the lever in one direction to carry said pawls away from the ratchet wheel, and means {or limiting the pivotal movement of the lever by the spring.

9. In a typewriting machine, the combination of a rotatably supported platen, a ratchet wheel rotatable with the platen, a line-space lever, means supporting the lever for pivotal and sidewise movement, a. pawl operable by said lever for rotating the ratchet wheel, an overthrow pawl operable by the lever adapted to engage the ratchet wheel subsequently to the engagement of the other pawl therewith to limit the pivotal movement of the lever in one direction, adjustable means for limiting the sidewise movement of the lever, a spring for normally swinging and sliding the lever in one direction to carry said pawls' away from the ratchet wheel, and a stop carried by said lever adapted to engage a relatively fixed abutment to limit the pivotal movement of the lever by said spring.

10. In a typewriting machine, the combination of a platen, a ratchet wheel connected to rotate with the platen, a slidably and pivotally supported line-space lever, a pawl carried by said lever for rotating the ratchet wheel, means for arresting the pivotal movement of the lever at two fixed points, and adjustable means for limiting the sliding movement of the lever.

11. In a typewriting machine, the combination of a platen, a ratchet wheel con nected to rotate with the platen, a slidably and pivotally supported line-space lever, a pawl carried by said lever for rotating the ratchet wheel, means for arresting the pivotal movement of the lever at two fixed points, adjustable means for limiting the sliding movement of the lever, and a spring for normally swinging and sliding the lever to one limit of its movement.

12. Line-spacing mechanism comprising a rotatable platen, a ratchet wheel connected to rotate With the platen, a line-space lever mounted adjacent the line-space wheel to swing about and slide longitudinally of an axis extending transversely of the platen and having a uniform pivotal movement at all times, adjustable means for limiting the sliding movement of the lever, a pawl carried by said lever adapted to engage and ro tate the ratchet wheel, and spring means for restoring the lever after a line-spacing movement thereof.

13. In a typewriting machine, the com loination of a platen. carriage, a rotatable platen mounted on the carriage, a ratchet wheel held to rotate with the platen, a shaft supported on the carriage adjacent the linespace wheel and parallel therewith, a linespace lever pivotally and slidahly mounted on said shaft, a pair of lined pawls carried by the lever spaced apart longitudinally of the shaft and adapted to successively engage the ratchet wheel, a spring connected with the lever and carriage for forcing the lever about and longitudinally of the shaft to carry the pawls away from the ratchet wheel, an abutment on the lever adapted to engage a fixed part on the carriage to limit the pivotal movement of the lever by the spring, and an adjustable stop mounted on the carriage for determining the normal position'of the lever lengthwise of the shaft.

14. In a typewriting machine, the combinationot a platen carriage, a platen rotatably supported on the car'iage, a linespace wheel rotatable with the platen, a linespace lever mounted on the carriage to swing lengthwise of the platen and slide 1 transversely of the platen, a line-space pawl and an overthrow pawl carried by the lever and adapted to engage the ratchet wheel at circumferentially spaced points successively, spring means for restoring the lever after a line-spacing movement thereof, means arresting'the pivotal'movement of the lever at a fixed point on its return stroke, and adjustable means for determining the normal position of the lever longitudinally of its axis.

15. In a typewriting machine, the com bination of a platen carriage, a platen rotatably supported on the carriage, a rod supported on the carriage transversely of the platen, a ratchet wheel rotatable with the platen, a sheet metal line-space lever slidably and pivotally held to said rod and provided with integral line-spacing and overthrow pawls spaced apart longitudinally of the rod and adapted to successively engage the ratchet wheel, and a single spring connected at its ends with said lever and carriage for restoring the lever.

16. In a typewriting machine, the combination of a platen carriage, a platen rotatably supported on the carriage, a rod supported on the carriage transversely of the platen, a ratchet wheel rotatable with the platen, a sheet metal line-space lever slidably and pivotally held to said rod and provided with integral line-spacing and overthrow pawls spaced apart longitudinally of the rod and adapted to successively engage the ratchet wheel, a single spring connected at its ends with said lever and carriage "for restoring the lever, and an adjustable stop mess i1 mounted on the carriage for determining the ii'iitial position of the lever longitui ilinally of the rod.

17. In a typewriting machine, the combination of a platen carriage, a platen ro-- tatably supported on the carriage, rod'supported on the carriage transversely of the platen, a ratchet wheel rotatable with the platen, a sheet metal line-space lever slidably and pi'votally held to said rod and provided with integral line-spacingland overthrow pawls spaced apart longitudinally of the rod and adapted to successively engage the ratchet wheel, a single spring connected at its ends with said lever and carriage for restoring the lever, and an adjustable stop mounted on the carriage for determining the initial position otthe lever longitudinally of the rod, said lever having a uniform pivotal movement in all adjusted positions of said stop. 18. In a typewriting machine, the combination of a rotatable platen-feeding element, a device cooperating withsaid element to rotate the same, means for swinging said device through a fixed arc about'an axis extending transversely ofthe axis of rotation of said element and shifting said device laterally longitudinally of the axis oi? its swinging movement, and adjustable means for controlling the extent oi lateral movement of said device. j

19. In a typewriting machine, the comhination of a rotatable platen-feeding element, a device cooperating with said element to rotate the same, means for swinging said device through a fixed are about an axis extending transversely of the axis of rotation of said element and shifting said device laterally longitudinally of the axis of its swinging movement, spring means for normally swinging said device awayfrom said element and shifting the device laterally, and means for varying the extent of the lateral shitting movement of said device by said spring means. i

20. In a typewriting machine, the combination of a platen teed wheel, a slidably and pivotally mounted feed pawhnranirally operable means for swinging said pawl through a t red are about an axis eirtending ransversely oi the axis of thel'feed wheel, spring means for normally swinging said pawl away from the wheel and sliding the same laterally, and. adjustabe means for arresting the sliding movement of the pawl under the influence of said spring means.

21. In a ty i ewriting machine, the combination of a platen carriage, a platen rotatably mounted on the carriage, a ratchet wheel rotatable with the platen, a line space lever, a feed pawl on said lever, means supporting said lever on the carriageto swing about and slide longitudinally of an axis extending transversely of the axis 01" the ratchet wheel, a shittable stop mounted on the carriage out of the path of the pivotal movement of the lever and adapted to be engaged by the lever to limit the sliding movement thereof, and spring means for normally swinging the lever and feed pawl away tom the ratchet wheel and sliding the lever laterally toward. said stop.

22. In a typewriting machine, the combination of a platen carriage, a platen rotatably mounted on the carriage, a ratchet wheel rotatable with the platen, a line space lever, a feed pawl on said lever, means supporting said lever on the carriage to swing about and slide longitudinally of an axis extending transversely of the axis of the ratchet wheel, a shiftable stop mounted on the carriage out of the path of the pivotal movement of the lever and adapted to be engaged by the lever to limit the sliding movement thereot, spring means for normally swinging the lever and feed pawl away from the ratchet wheel and sliding the lever laterally toward said stop, and means for always arresting the swinging movement of the lever in opposite directions at the same two points.

23. In a typewriting machine, the combination of a platen carriage, a platen rotatably mounted on the carriage, a ratchet wheel rotatable with the platen, a line space lever, a feed pawl on said lever, means supporting said lever on the carriage to swing about and slide longitudinally of an axis extending transversely of the axis of the ratchet wheel, a shift-able stop mounted on the carriage out of the path of the pivotal movement of the lever and adapted to be engaged by the lever to limit the sliding movement thereof, spring means for normally swinging the lever and feed pawl away from the ratchet wheel and sliding the lever laterally toward said stop, means for arresting the swinging movement of the lever by said spring means at a fixed point, and an overthrow-preventing pawl carried by said lever adapted to engage the ratchet wheel subsequently to the engagement of the teed pawl with said wheel.

24-. in a typewriting machine, a platen teed wheel, a line-space lever, means supporting said lever to swing about and slide longitudinally of an axis extending transversely of the axis of the feed wheel, a feed pawl and an overthrow-preventing pawl carried by the lever and adapted to successively engage the feed wheel, spring means for normally swinging the lever and pawls away from the teed wheel and sliding the lever longitudinally of its pivotal axis, and a rotatably adjustable cam device mounted independently of the lever and coacting therewith to shift the lever longitudinally of its axis against the action of said spring means to vary the initial position of the lever and pawls relatively to the feed Wheel.

In testimony whereof I hereunto affix my signature.

KENNETH E. MARSH. 

